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Named in reference to the dominance of sodium (Na) in the composition and for the relationship to lemoynite. Found only at the type locality at the Poudrette quarry at Mont Saint-Hilaire in Quebec, Canada where is occurs with microcline, lemoynite, and sulfides in altered pegmatites that cut nepheline syenite, as well as in unaltered pegmatites. Appears as colorless to white to pink, bladed to prismatic crystals.
Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)
IMA/CNMNC List of Mineral Names (2009) and Candian Mineralogist 39 (2001), 1295
Named for the Greek for “sodium,” natrio, in reference to the mineral’s sodium content, and for “stone,” lithos. Natrolite is a common mineral that occurs in cavities in basalts and other igneous rocks as one of the last minerals to forms, and also occurs as a filling in seams in granites, gneisses, and syenites. Associated minerals include zeolites, calcite, nepheline, sodalite, and quartz. Natrolite hundreds of known localities including in Germany, France, England, Ireland, Norway, Russia, the United States, and Canada. Natrolite is pyroelectric and piezoelectric, and will generate a charge in response to temperature and pressure changes, respectively. It will commonly fluoresce an orange to yellow under ultraviolet light.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/natrolite.pdf